Screw driver and the like



Nov. 4, 1947. R. J. cAMPsMlTH 2,430,044

SCREWDRIVER AND'THE LIKE I v Filed Sept. 19, 1945 l Inventar @BERT JJHN CAMPsm/TH ills L". By

W a -Attorneys Patented Nov. 4, 1947 UNITED STATES PATENT OFFICE SCREW DRIVER AND THE LIKE Robert John Campsmith, Chicago, Ill.

Application September 19, 1945, Serial No. 617,224

1 Claim.

My invention relates to improvements in screw driving tools and has for its object to provide means whereby a screw may be rapidly driven home.v Y

Another object of this invention is to provide a power screw driver so constructed that it will cease turning when the screw reaches the desired depth.

A further object of my invention is to provide a rotary tool having means whereby the same will cease operation upon reaching a predetermined position.

A still further object of my invention is to provide in a rotary tool a depth gauge and control.

Other features and advantages will become more readily apparent from the following description and the accompanying illustrative drawings in which:

Figure 1 is a longitudinal sectional View of my tool,

Figure 2 is an elevational view thereof shown partly broken away,

Figure 3 is a detail of a clutch,

Figure 4 is a section on line 4--4 of Figure 3,

Figure 5 is a plan View of a gauge member,

Figure 6 is a sectional View on line 6--6 of Figure 2, and

Figure 7 is a detail of gauge lock.

In the above drawings as well as in the specification to follow, the same characters of reference indicate the same parts throughout.

While one embodiment of my invention is illustrated in the above referred to drawings, it is to be understood that they are merely for the purpose of illustration and that various changes in construction may be resorted to in the course of manufacture in order that the invention may be utilized to the best advantage according to circumstances which may arise, without in any way departing from the spirit and intention of my device, which is to be limited only in accordance with the appended claim. And while I have stated the primary field of utility of my invention it remains obvious that it may be employed in any other capacity wherein it may be found applicable.

The invention disclosed in the accompanying drawings consists of a cylinder II, having an inturned flange I2, at its lower end \I3, upon which seats out-turned flange I4, on the upper end i5, of the enlarged tubular portion I5, of a guide l?, for the shank I8, which in the present instance is provided with a screw driver terminal i5, in the reduced bore 2B, the lower end 2l, of which terminates in a conical cavity 22, to receive screw heads 23, of Varying diameter.r The upper end 24, of the shank I8, terminates in an enlarged head V25, Xedto the cylinder II, by means of a pin 26, and screws 2l and 28, to rotate with said cylinder II.

Seated between the head 25, and the shoulder 29, formed by the reduced bore 20, is a spring 30, coiled around said shank I8, which'spring is adapted to hold the guide I'I, normally in lowered position. The upper end 3I, of head 25, forms a clutch member 32, adapted for engagement with a similar clutch member 33, formed in the lower face of the enlargement 34, of the lower end 35, of a shank 35. The members 34 and 25 are provided with opposing center bores 31 and 38, within which seats a pin 39.

Within the upper part 40, of the cylinder II, a strong spring 4I, is coiled around the shank 35, and seats between the member 34, and the head 42, of a cap 43, internally threaded as at 44, to screw upon the threaded upper terminal 45, of the cylinder II. The said head 42, is provided with a bore 46, through which the upper end 4l, of the shank 36, extends, The terminal 48, is shaped to lit into the pod 49, of a brace bit socket '50.

The cap 43 will be screwed down over the outer, upper surface 5I of the member I I, the lower edge 53 of the cap 43 indicating the distance the cap 43 must be screwed down for the purpose of compressing the spring 4I, in order to hold the said clutch members interengaged until the screw has been sunk its full length at which time the tension of the spring, as adjusted, will no longer hold said clutch members together and the slipping of which one over the other will through the noise or vibration signify to the operator that the screw has reached its limit of insertion in the material 54.

The inner cylindrical surface 55, of the cap 43, is provided with a series of vertical channels 53, which are adapted to receive the key 5l, on the free end of the leaf spring 58, xed to the inner surface of the member II, by a rivet l59. The spring 58, is provided with a button 60, operating through a bore 6 I, in the member I I, by means of which the key 51, may be released to permit the cap 43, to be turned. A slot 62, is provided through the wall 163, through which the key is adapted to project for engagement with any one of the slots 55. The purpose of locking the cap is in order to keep it from turning as the cylinder II, is rotated by a brace or drill chuck.

The rotation of shank 35, by a brace or lathe or drill chuck will rotate cylinder I I, through head 25, for a predetermined time and with them the shank I8, to drive the screw 23. After the screw is driven home the clutch will slip. The spring 30, will give as the screw enters the member 54, to permit the screw driver blade I9, to follow the screw down on in. The elongated recess 22, will act to guide the screw and to hold it in true alignment with the screw driver.

It is thought that persons skilled in the art to which the invention relates will be able to obtain a clear understanding oi the invention after con-V sidering the description in connection with the drawings. Therefore, a more lengthy description is regarded as unnecessary.

Changes in shape, size and rearrangement of. details and parts such as come within the purview of the invention claimed may be resorted to, in actual practice, if desired,

Having now described my invention that which clutch head and the plunger clutch head in engagement, a pin aligning said clutch members, a hollow cylinder movably mounted in said rst mentioned cylinder through which said screw driver projects, said hollow cylinder having a flared entrance, a coil spring about said screw driver for normally holding the same in raised position, a cap threaded upon said first mentioned cylinder provided with a series of longitudinal slots, means within said cylinder for engaging said slots, said means comprising a spring having a button projecting through an opening in said cylinder and a key spaced from said button projecting through another opening in said cylinder adapted to selectively enter one of said slots.

ROBERT JOHN CAMPSMITH.

REFERENCES CITED The following references are of record in the iile of this patent:

UNITED STATES PATENTS Number Name Date 1,855,456 Miller Apr. 26, 1932 1,126,219 Hupp Jan. 26, 1915 1,503,446 Hedglon July 29, 1924 

